Serena the Pious

Serena the Pious enters the battlefield with 8 piety counters on it. Serena the Pious gets -1/-0 for each piety counter on it. {4}{W}: Gain life equal to the number of piety counters on Serena the Pious. {B},{T}: Add or remove a piety counter from Serena the Pious. If a piety counter is removed this way, deal 2 damage to any target.